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Offlineuninc4life2010
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Is a 550 cfm squirrel cage blower enough to for a 24x24x12 HEPA filter.
    #22001151 - 07/26/15 06:17 PM (8 years, 6 months ago)

I'm planning on building a laminar flow hood, and I was wondering if this 549 cfm fan will be enough to ensure proper laminar flow on a 24"x24"x12" HEPA filer?

http://www.ebay.com/itm/221822938367?_trksid=p2063133.m570.l5006&_trkparms=gh1g%3DI221822938367.N21.S2.M2692.R1.TR2&autorefresh=true

Hopefully this will provide enough airflow.  Also, I plan on building the box around the filter so that the rear 12" where the blower will be mounted will be empty space.  I've been told that there need to be empty space behind the filter to build up static pressure or something.  I'm not entirely sure the reason why, but will 12" of space be enough?  Thanks!


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Offlineuninc4life2010
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Re: Is a 550 cfm squirrel cage blower enough to for a 24x24x12 HEPA filter. [Re: uninc4life2010]
    #22011109 - 07/28/15 06:06 PM (8 years, 6 months ago)

Anyone?


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Offlinebakenast
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Re: Is a 550 cfm squirrel cage blower enough to for a 24x24x12 HEPA filter. [Re: uninc4life2010]
    #22011250 - 07/28/15 06:27 PM (8 years, 6 months ago)

I dont think so,, but what filter did you get 24x24x12?  whats the filtration and resistance that the filter is tested at, you have to match your fan to the filter,, I use a inline fan thats overkill with a speed controller for mine works wonders


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Offlineuninc4life2010
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Re: Is a 550 cfm squirrel cage blower enough to for a 24x24x12 HEPA filter. [Re: bakenast]
    #22011576 - 07/28/15 07:23 PM (8 years, 6 months ago)

Quote:

bakenast said:
I dont think so,, but what filter did you get 24x24x12?  whats the filtration and resistance that the filter is tested at, you have to match your fan to the filter,, I use a inline fan thats overkill with a speed controller for mine works wonders




This filter: http://www.ebay.com/itm/360960905857?_trksid=p2055119.m1438.l2649&ssPageName=STRK%3AMEBIDX%3AIT

The test flow was 1000 cfm.  I'm not sure about this one, but a similar model lists 1.0" w.g, but I'm not really sure what that means.  I was told that an inline fane creates turbulent air, cannot build static pressure, and is not ideal for a flow hood.  I was instructed that a squirrel cage blower was necessary because of the way that the air comes out of the blower.


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InvisibleViolet
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Re: Is a 550 cfm squirrel cage blower enough to for a 24x24x12 HEPA filter. [Re: uninc4life2010]
    #22012505 - 07/28/15 10:31 PM (8 years, 6 months ago)

Actually it should be reasonably near perfect, just from a quick look.


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Offlinetetherface
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Re: Is a 550 cfm squirrel cage blower enough to for a 24x24x12 HEPA filter. [Re: Violet]
    #22012595 - 07/28/15 10:51 PM (8 years, 6 months ago)

this is straight from T.M.C by stamets "if a micron filter measures 2fett by 2 feet by 6 inches deep and has a static pressure rating of 1.o inches of resistance, the fan required would have to be capable of pushing 400 C.F.M at 1 inch of static pressure
if X=the desired net C.F.M of a fan at i" S.P and
Y=4 square feet "the square footage of the filter face"
THEN x=100 feet per minute (times) Y
X=100 feet per minute (times) 4 square feet
X=400 cubic feet per minute
this means that a fan capable of pushing 400 feet per minute at 1" of static pressure is needed to yield the optimum air velocity of 100 feet per minute."

so it seems to me that if your fan is rated at 1" static pressure (that number you didnt know what it meant) your right on the money so good luck bro and if you have any problems go to your library they prolly have this book i referenced this from(thats where i got mine lol) good luck bro


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Offlinetonpole
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Re: Is a 550 cfm squirrel cage blower enough to for a 24x24x12 HEPA filter. [Re: tetherface]
    #22012964 - 07/29/15 01:09 AM (8 years, 6 months ago)

Ive built a flowhood with a inline before, they work just fine although there is some turbulence (the fan was built inside the box) it hadnt compromised its effectiveness, putting a fan outside the box would reduce turbulence but increase bulk, consider how wide your reach is. You will want a 6" deep filter and perhaps something a little smaller unless you are built or have someone to help you move it, flowhoods are god awfully heavy, the filters are heavier than the fans. For a filter 24x24 you will need at least 1200cfm, these fans are huge, a 18x24 filter would require a 800cfm fan. Blowers are good but its hard finding one thats powerful enough for larger filter sizes.


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OfflineMrneogeo
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Re: Is a 550 cfm squirrel cage blower enough to for a 24x24x12 HEPA filter. [Re: tonpole]
    #22013074 - 07/29/15 02:11 AM (8 years, 6 months ago)

The filter is .6 w.g. so u will need to dial the fan back a bit. Will work great, just make your workspace long enough to be useful, i find i run out of space even though i have 4 squared feet. If u want or need a design for a nice cabinet i spent over 60 hours building and finishing one based off a similar filter.

Eta:

At .6 w.g. you'll get 435 cfm. I checked the data sheet 4 u.


Edited by Mrneogeo (07/29/15 02:14 AM)


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InvisibleViolet
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Re: Is a 550 cfm squirrel cage blower enough to for a 24x24x12 HEPA filter. [Re: Mrneogeo]
    #22014003 - 07/29/15 09:35 AM (8 years, 6 months ago)

Oh it's just .6? I thought it was 1 for some reason


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Offlineuninc4life2010
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Re: Is a 550 cfm squirrel cage blower enough to for a 24x24x12 HEPA filter. [Re: tetherface]
    #22014278 - 07/29/15 10:34 AM (8 years, 6 months ago)

Okay, great!
Quote:

tonpole said:
Ive built a flowhood with a inline before, they work just fine although there is some turbulence (the fan was built inside the box) it hadnt compromised its effectiveness, putting a fan outside the box would reduce turbulence but increase bulk, consider how wide your reach is. You will want a 6" deep filter and perhaps something a little smaller unless you are built or have someone to help you move it, flowhoods are god awfully heavy, the filters are heavier than the fans. For a filter 24x24 you will need at least 1200cfm, these fans are huge, a 18x24 filter would require a 800cfm fan. Blowers are good but its hard finding one thats powerful enough for larger filter sizes.





I keep hearing that a 549 cfm fan would be enough for this size filter.  I've never heard of anyone using that strong of a fan for this application with a 24x24 size filter.


Quote:

tetherface said:
this is straight from T.M.C by stamets "if a micron filter measures 2fett by 2 feet by 6 inches deep and has a static pressure rating of 1.o inches of resistance, the fan required would have to be capable of pushing 400 C.F.M at 1 inch of static pressure
if X=the desired net C.F.M of a fan at i" S.P and
Y=4 square feet "the square footage of the filter face"
THEN x=100 feet per minute (times) Y
X=100 feet per minute (times) 4 square feet
X=400 cubic feet per minute
this means that a fan capable of pushing 400 feet per minute at 1" of static pressure is needed to yield the optimum air velocity of 100 feet per minute."

so it seems to me that if your fan is rated at 1" static pressure (that number you didnt know what it meant) your right on the money so good luck bro and if you have any problems go to your library they prolly have this book i referenced this from(thats where i got mine lol) good luck bro




My only concern is that because I was looking at a 12" deep filter rather than a 6" deep filter, I would need a stronger fan.  I'm not sure if it would need to be twice as strong, but I figure a deeper filter would require a little more airflow.


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OfflineMrneogeo
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Re: Is a 550 cfm squirrel cage blower enough to for a 24x24x12 HEPA filter. [Re: Violet]
    #22014285 - 07/29/15 10:35 AM (8 years, 6 months ago)

Test flow was 1 w.g. @ 1000 cfm. The filter is larger so larger means less resistance on the filter. .6 w.g. gives him 435 cfm.

Eta: just read your post above this one. The deeper filters require less pressure because the pleats have more areaa


Edited by Mrneogeo (07/29/15 10:37 AM)


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